Find the Average Value of the Function $f(t)=9 t \sin \left(t^{2}\right)$

Multiple Choice

Find the average value of the function $f(t) =9 t \sin \left(t^{2}\right)$ on the interval $[0,20]$ . Round your answer to 3 decimal places.

A) 9.342
B) 0.45
C) 0.432
D) $0.342$
E) 18